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I've built something similar (although it was 230VAC->48VDC).
I wouldn't recommend it unless you have someone experienced to help you, but if you're gonna go ahead and do it anyway then here's what I did:

Use a transformer with about 1:3 ratio (1:3.333333...) to get the input voltage down to ~35,5VAC (because that's RMS, multiply by the square root of 2 and you get ~50V - which will be the peak voltage once rectified).
Then, use a diode bridge to rectify and a capacitor (preferrably a big one to keep it stable if you plan on pulling much current) to smooth the output.

With that said, I'd rather recommend you get an off the shelf device as this is quite dangerous if you're not 100 % sure what you're doing!
I won't be responsible if you get electrocuted or set yourself or anything else on fire...

Xenomai is a real-time development framework cooperating with the Linux kernel, to provide a pervasive, interface-agnostic, hard real-time support to user space applications, seamlessly integrated into the Linux environment.

Try the following link in firefox 3.6 and firefox 4, and check the frame rate. It should run at 50 fps, which it does without problem in Firefox 4, using hardware acceleration, but it runs at half of that in Firefox 3.6.

start firefox with this command instead: forefox -no-remote. If you have an icon on the desktop you can change the command it runs when you click on it.

Added bonus: add -ProfileManager as well, and it will start the profile manager every time you start the browser. with the -no-remote option, you can have multiple profiles running at the same time, in different windows.